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I agree with Dick. Bettendorf underframes were not replaced, just the supply of frames supplemented with RR Design.
On Aug 1, 2020, at 2:33 PM, Dick Harley via groups.io <dick.harley4up@...> wrote:
Tony knows more than I do, but the RR Design did not "replace" the 30-ton Bettendorf underframes on PFE reefers. They were a means to increase the number of cars PFE could get, without being limited by Bettendorf. And old Bettendorf underframes were used in PFE rebuilds up through the R-30-21 class in the mid-1940s.
I use the terms "RR Design" and "Built-Up" interchangeably for those underframes. Not sure I have a preference. Many diagrams use both.
Here is a summary about them:https://harley-trains.smugmug.com/PFETrainPhotos/PFE-Wood-Ice-Reefers/Bettendorf-vs-Built-Up/i-drRrvqG/A
I'll soon announce here more info on PFE wood reefer rebuilds on my SmugMug site.
If there was a significant problem with cracking of Bettendorf underframes on PFE reefers, that's news to me.
Laguna Beach, CA